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【单选题】
下列实验操作中错误的是( )A.
蒸发操作时，应残留少许液体，停止加热，再利用余热使水分完全蒸干
B.
蒸馏操作时，应使温度计水银球位于蒸馏烧瓶的支
C.
分液操作时，分液漏斗中下层液体从下口放出，上层液体从上口倒出
D.
萃取操作时，应选择有机萃取剂，且萃取剂的密度必须比
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【简答题】食品卫生标准中微生物指标一般分为 , , 。
【单选题】Visitors to St. Paul Cathedral are sometimes astonished as they walk round the space under the arch to come up a statue which would appear to be that of a retired armed man meditating upon a wasted li...
A.
they do not expect it to be there
B.
it was dressed in Roman costume
C.
it was situated in the dome
D.
it was dressed in eighteenth-century costume
【简答题】综合式版面
【单选题】Visitors to St. Paul Cathedral are sometimes astonished as they walk round the space under the arch to come up a statue which would appear to be that of a retired armed man meditating upon a wasted li...
A.
they do not expect it to be there
B.
it was dressed in Roman costume
C.
it was situated in the dome
D.
it was dressed in eighteenth-century costume
【单选题】Visitors to St. Paul Cathedral are sometimes astonished as they walk round the space under the arch to come up a statue which would appear to be that of a retired armed man meditating upon a wasted li...
A.
they do not expect it to be there
B.
it is dressed in Roman costume
C.
it is situated under the arch
D.
it is dressed in eighteenth-century costume
【单选题】为什么不能随便给陌生人开门?( )
A.
门外有大灰狼；
B.
对陌生人不了解，可能会伤害到自己；
C.
陌生人没有给我带礼物；
D.
只要提高警惕，提高辨识力，就可以了。
【单选题】Choose the best summary of the passage (AR1).
A.
The writer uses the Eiffel Tower as an example of a monument that has become a beloved symbol in spite of being unpopular with some people at the time of its creation. Ironically, the Eiffel Tower was not built with any greater aim than simply to be large and imposing, yet now it is seen as representing the city of Paris.
B.
The writer claims that the Eiffel Tower, unlike similar tall or large structures, serves no utilitarian or aesthetic purpose. Today it is praised by ordinary people who cannot understand or appreciate truly great architecture.
C.
The writer uses the Eiffel Tower to show how the size of a building determines its popularity. Although the Eiffel Tower had no serious purpose or function when it was built, because it was so much taller than other buildings around it, people came to see it as imposing and important.
D.
The Eiffel Tower was not built with a greater aim than simply to be large and imposing, yet now it is seen as representing the city of Paris.
【单选题】为什么不能随便给陌生人开门?( )
A.
门外有大灰狼；
B.
对陌生人不了解，可能会伤害到自己；
C.
不能相信所有陌生人；
D.
只要提高警惕，提高辨识力，就可以了。
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